skiingaccident,
When your PT stated that it would take 12 to 16 weeks for total recovery, that was just the time for the bone to unite. That does not take into account the time for the soft tissues to heal and be rehabilitated. The following time frames are just for time to bony union:
Time to Union;
- low energy fractures: 10-13 weeks;
- high energy fractures: 13-20 weeks;
- open fractures: 16-26 weeks
---- type 3B & 3C open fractures requires 30 to 50 weeks for consolidation;
- distal tibial fractures may be more prone to non union than proximal fractures due to absence of muscular soft tissue envelope;
- in the report by Anne Skoog et al., the authors studied 64 consecutive patients with a tibial shaft fracture; ---> 12 months after the injury, 44 percent had not regained full function of the injured leg, although all but two of the patients had returned to preinjury working status;
---- references: "One-Year Outcome After Tibial Shaft Fractures: Results of a Prospective Fracture Registry" A. Skoog. J Orthop Trauma 15(3):210-215, March/April, 2001.
It often takes a lot longer for the soft tissues to be rehabilitated than it does to get the bone to unite. So it is not uncommon for it to take as much as a year to 18 months for full recovery from a tibial shaft fracture. Usually, the surgeon will allow the patient to begin working on ankle range of motion, before allowing weight bearing. As to when weight bearing is allowed, depends upon the character of the fracture, is it a stable construct. Also, can the IM nail withstand the stress applied to it, if the bone construct cannot take the majority of the stress. IM nails can bend and break, if stresses too many times.
But, once you are allowed to start bearing weight, then you will be able to start working on regaining muscle mass and strength. If you were able to do ROM before this, it will really help when you begin ambulating.
Once you have ROM and strength built back up, then you have to work on balance, agility, and proprioception. Then come the sport specific skills.
So, you can see why it often takes quite a while to fully recover from a tibia fracture. Some patients can and do get back a little faster, but they are usually professional or collegiate athletes who have full time staffs to help with their rehabilitation needs.
Sounds like you are motivated to get back and that is probably the most important aspect in recovery. As you stated, listen to the surgeon and therapists. Do what they suggest. Some stress across the fracture site is good, as it stimulates the bone to lay down more callus (Wolff's Law). But, too much stress, too soon, can cause the fracture and hardware to fail. So, again, follow your surgeon's instructions.
Work hard in PT, eat a good diet high in protein, calcium, vitamin D, do not smoke or use smokeless tobacco, and you should be up and about with a healed tibia fracture in a few months.
Good luck.